The charge that has been levelled at banks this year - that they are compromising their mortgage underwriting standards as they compete ever more intensely for market share - is not borne out by the latest Australian Prudential Regulation Authority data.According to APRA's June quarter report on the property exposures of authorised deposit-taking institutions, 12.5 per cent of new loans in the June quarter had loan-to-valuation ratios equal to or greater than 90 per cent.This is the lowest proportion of high-LVR loans recorded in any quarter over the past year.ADIs approved A$84 billion of new residential loans in the June quarter, taking total residential loans on their books to $1.2 trillion.Low-doc loans, another risk indicator, accounted for 2.9 per cent of all mortgages in the June quarter but made up only 0.7 per cent of new loans in the quarter. The average balance of low-doc loans has fallen steadily over the past year, from $216,000 in the June quarter last year to $208,000 a year later.Taking all ADI lending activity into account, there were $19.9 billion of impaired facilities at the end of June - down 8.3 per cent on the March quarter and down 22.9 per cent on the June quarter last year.Impaired facilities as a proportion of total loans and advances have fallen from 1.1 per cent in the June quarter last year to 0.8 per cent a year later.Past due items of $12.2 billion in the June quarter were 1.5 per cent less than in the June quarter last year. One area where mortgage lending might have become more risky is lending to investors. Investment loans accounted for 33.8 per cent of total residential loans in the June quarter. This proportion was up 3.3 per cent since the March quarter and up 10.9 per cent since the June quarter last year. In the June quarter, 37.9 per cent of new loans were for investors.